Air-heating furnace



Man-ch 25, 19240 mswm L. LEE

AIR HEATING FURNACE Filed June 2. 1923 5 Sheets-Sheet 1 March 25 1924.

1,488,011 11 1.. LEE

AIR HEATING FURNACE Filed June 2.. 1925 5 Sheets-Sheet 3 INVENTOR 16w comes into direct contact with t an t @FFE@EO Lmr can, or Yonaesrown', OHIO. AIR-HTING ruanaca Application flied June 2,

To all whom it may concern:

Be it known that I, LEIF LEE, a. citizen of the United States, residing at Youn town,

county of Mahonin and State of Ohi o have d invented a new an useful Improvement in vAir-Heatin Furnaces, of which the following is a ful clear, and exact descri tion. ing furnaces, and more particularly to air eating furnaces of the general type disclosed in my two prior Patents Nos. 1,319,654 of October 21, 1918, and 1,388,583 of August-23, 1921. 1

11 Important object of the invention is to provide a novel construction and arrangement of the parts of afurnace of the above type, whereby to insure a more thorough combustion of the heating medium before said medium is brought into direct contact with the heating elements, and wherein the heat of combustion of said heating medium out of direct contact with said heating elements may be utilized to heat by conduction a chamber in which said heating elements are arranged;

In the accompanying drawings, I have shown, for purposes of illustration only, one embodiment of the present invention, it being understood that the drawings do not de ne the limits of the invention, aschanges may be made in the construction and operation therein disclosed without departin from the spirit of the invention or scope my broader claims. I y

In the drawings:

Figure 1 is a longitudinal vertical sectional view of an air heating furnace emodying myinvention,

igure 2 is a view, partly in horizontal section and partly in plan, of the furnace shown in Figure 1,

Fi re 3 is a sectional view taken on the line IIIII of Figure 1, and

F1 re 4 is a sectional view taken on the line IV-IV of Figure 2.

'By the present invention I have provided a construction in which all of the heating elements, which may be of the type d18- closed in my abov -mentioned atents, are

arranged ina single heating 0 amber extending longitudinally of the furnace and separated by a thin partition wall of refractory material from a flue coextensive with the heating chamber and traversed by the heating medium before said heatlng med 1933. Serial No. 648,082.,

heating elements. In this flue, a complete combustion of the heating medium takes place, and at the same time the heating meim has its temperature suificiently lowered, so that it Wlll not injure the heating elements when it comes into direct contact With'sa'id heating elements. The heat of The present invention relates to air heatcombustion of the heating medium in the flue serves to heat by conduction through the thin partition wall the chamber in which the heating elements are arra ed.

Referring to the drawings, t e reference numeral 2 indicates the main combustion chamber arranged at one end of the furnace and provided with the usual grate 3 and ash pit 4. Extending longitudinally of the furnace and separated from the combustion chamber 2 by a vertical partition wall 5 is the heating chamber 6, which extends from said partition wall 5 to the opposite end wall 7 of the furnace. Above the heating chamber 6 and coextensive therewith is a horizontal flue 8. The flue 8 is separated from the heating chamber 6 by a thin arched partition wall 9 of refractory ma terial, said wall constituting the roof of the heating chamber and the floor of the fiue 8. The partition wall 9 is supported at its edges upon ledges 10 projecting inwardly from the side walls of the furnace, and from the partition wall 5. Said partition wall 9 terminates short of the end wall 7 of the furnace to provide a port 11 between the end of said partition wall and said end wall, whereb to establish communication between the flue 8 and the heating chamber 6. The flue 8 communicates at its front end with the combustion chamber 2 through a port 12 between the upper edge of the partition wall 5 and the roof 13 of the furnace. It will be seen by reference to Figures 3 and 4 that the heating chamber 6 and the flue 8 extend the full width of the furnace.

In the heating chamber 6 are located the heatin elements which, as inthe constructions disclosed in my prior patents above referred to may be pipes 14 of inverted U- form. The pipes 14 are arranged in arallel relation and extend transversely o the heating chamber, with sufic ent space between the pipes to permit a free circulation of the heating medium. The pipes 14, at one end, open downwardly throu ports 15 in the floor of the heating cham r into a flue 16 =5 elongitudmally of the furnace with a series of cleaning beneath one side of the heating chamber and separated by a partition wall 17 from a similar flue 18 beneath the other side of the heating chamber, and communicating with the other ends of the pipes 14: through ports 19 in the floor of said heating chamber.

The cold air to be heated is supplied to the flue 16 through a flue 20 by a fan or blower 21. This cold air circulates through the heated pipes 14: in the chamber 6 and is discharged into the flue 18, which has an outlet port 22 through the side wall of the furnace and substantially opposite the flue 20 which connects the fan 21 with the flue 16.

The heating chamber 6 is provided w th exhaust ports 23 and 2t through the opposite side walls of the furnace adjacentthe front end of said heating chamber. These ports 23 and 24 communicate with each other and with a pipe 25 leading to an exhaust fan 26 through vertical flues 27 and 28 and a horizontal connecting flue 29, said flues 27,28 and 29 being formed by a metal casing which extends vertically of the side walls of the furnace and horizontally over the top thereof. By reason ofthis construction, the exhaust products of combustion are drawn by the fan 26 equally from both sides of the heating chamber 6, so that the pipes 14 will be uniformly heated. As shown, the blower 21 and the fan 26 are actuated by a common motor 30, whereby the fan 26 is stopped and started simultaneously with the stopping and starting of the blower 21.

The heating chamber 6 may be provided doors 31 in one side wall of the furnace, and the flue 8 may be provided with a cleaning door 32 in the end wall 7. It will be seen that the partition wall 9 which separates the heating chamber 6 from the fine 8 is removable, thereby affording ready access to the heating elements 14.

The operation of the furnace is as follows: The products of combustion, mixed with the required amount of air supplied through suitable openings in the front end wall of the furnace, pass from the main combustion chamber 2 into the horizontal flue 8 through the port 12, and after traversing the flue 8 pass downwardly through the port 11 into the heating chamber 6 at the rear end of said chamber, and then traverse said chamber in direct contact with. the heatin elements 14 therein, and are exhausts through the ports 23 and 24. In passing through the long flue 8, the products of combustion are completely burned, and their temperature is sufliciently lowered so that they will not injure the pipes 141 when they come into direct contact therewith. The heat of combustion produced in the flue 8 is utilized to heat the chamber 6 by conduction through the thin partition wall 9.

The advanta es of the invention arise from the nove arrangement of heating chamber and circulating flue, whereby a more efficient operation tending to produce a maximum heat interchange is secured.

I claim:

1. In an air heating furnace, a combustion chamber at one end of the furnace, a heating chamber extending longitudinally of said furnace, afiue coextensive with said heating chamber and se arated therefrom by a partition wall, said (lire communicating at one end with said combustion chamber and at its other end with said heating chamher, said heating chamber having its exhaust outlet adjacent the end thereof opposite the end which communicates with said flue, a plurality of heating elements in said heating chamber, and means for effecting a circulation of air through said heating elements, substantially as described.

2. In an air heating furnace, a combustion chamber at one end of the furnace, a heating chamber extending longitudinally of said furnace and terminating at the other end thereof, said heating chamber being separated from said combustion chamber by a partition wall, a flue above said heating chamber and coextensive therewith, said flue communicating at one end with said combustion chamber and at the other end with said heating chamber, said heating chamber having its exhaust outlet at the end thereof opposite flue, a plurality of heating elements arranged in said heating chamber, and means for effecting a circulation of air through said heating elements, substantially as described. I

3. In an air heating furnace, a combustion chamber. at one end of the furnace, a heating chamber extending longitudinally of said furnace and terminating at the other end thereof, said heating chamber being separated from said combustion chamber by a partition wall, a flue above said heating chamber and coextensive therewith, said flue communicating at one end with said combustion chamber and at the other end with said heating chamber, said heating chamber having its exhaust outlet at the end thereof opposite the end in communication with said flue, a plurality of heating elements arranged in said heating chamber, said heating elements communicating at one end with a cold air flue extending longitudinally of said furnace beneath one side of said heating chamber and coextensive therewith and at the other end with a heated air flue extending beneath the other side of said heating chamber and co-extensive therewith, and means for supplying air to said cold air flue, substantially as described.

a. In an air heatin furnace, a combustion chamber, a heating c amber, a due coextenheating chamber Leeann I 'sivewith said heating chamber and commumcating at one end withsaid combustion chamber and at the other end with said heating chamber, said heating chamber having side thereof adjacent theend thereof opposite the end which communicates with said flue, and means for exhausting the products of combustion from said ports, substantially as described.

11 an air heating furnace, a combustion chamber atone end of the furnace, a

extending from said combustion chamber 'to the opposite end of the furnace and of the full width of said furnace, a flue above said heating chamber and coextensive in length and wldth therewith and separated-therefrom by a partition wall, said flue communicating at one end with said combustion-chamber and at the other end with said heating chamber, said heatin chamber having its exhaust outlet at the end 1 thereof'opposite the end in communication said cold air flue,

with said flue, a series of heatin elements arranged in said heating cham r transversely 'thereof, each of said heating ele ments opening at its opposite ends through the floor flue extending longitudinally of said furnace beneath one side of said heatin chamber and having one end of each of sand heating elements in communication therewith, a heated air flue extending longitudinally of said furnace beneath the other side of said heating chamber and having the other end of each of said heating elements in communication therewith, means for and means for exhausting the products of combustion from said heating chamber, substantially as described.

6. In an air heating furnace, a combustion chamber, a flue and a heating chamber separated from each other by a partition wall extending longitudinally of said fine of saldheating chamber, a cold airsupplying air toand said chamber, said flue communicating at one end with said combustion chamber and at the other end with one end of said heating chamber, said heating chamber havmg an exhaust port at each side thereof ad jacent the end of said chamber op osite the end in communication with said ue, a flue extending exteriorly of the furnace and conmeeting said ports, and means for exhausting the products of combustion from said lastmentioned flue, substantially as described.

In an air heating furnace, a combustion chamber at one end of the furnace, a heating chamber extending from said combust-ion chamber to the opposite end of said g and separated therefrom by a partition Wall which forms the roof of said heating chamber and which is det-achably supported upon a ledge projecting from said vertical partition wall and from the opposite side walls of the furnace, said partition between said fiue and heating chamber terminating short of the rear end of said furnace to provide a port for establishing communication between the rear ends of said flue and heating chamber, said fiue at its front end communicating with said combustion chamber through the space between the top of. said vertical partition and the top of said fur-- nace, said heating chamber having its exhaust outlet adjacent the front end thereof, heating elements arranged in said heating chamber, and means for effecting a circulation of air through said heating elements, substantially as described.

In testimony whereof I have hereunto set my hand.

LEIF LEE.

the top of said furnace, 

